Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 3, Issue 46, Pages 23323-23332Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta05403f
Keywords
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Funding
- Development Program of Korea Institute of Energy Research [B5-2414]
- Dongguk University Research Fund
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Electrochemical flow capacitors (EFCs) are highly promising for grid-scale energy storage since they benefit from having advantages of both electrochemical capacitors and flow batteries, including their high power density, long cycle lifetime, and scalable energy capacity. Here, we demonstrate a high-performance flow capacitor using redox-active hydroquinone (HQ)-based pseudocapacitive slurry electrodes. The maximum capacitance value of 513 F g(-1) is attainable for a slurry with a 0.38 M HQ redox mediator. Considering both the rate performance and capacitance of slurry electrodes, the optimum HQ concentration is 0.3 M of HQ. The as-prepared slurry electrodes show the highest capacitance and energy density (similar to 14 W h kg(-1)) among the previously reported slurry electrodes for aqueous flow capacitors. Furthermore, we performed first-principles calculations to understand the effect of HQ grafting on the activated carbon pore texture and the origin of increased capacitance by HQ mediators at the electrolyte and electrode interface.
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